玄武岩-碳纤维/矿渣混凝土力学性能正交试验

Orthogonal experiment on mechanical properties of basalt fiber-carbon fiber/slag concrete

应用正交试验法开展了16组玄武岩-碳纤维(BF-CF)/矿渣混凝土和1组C40级基准混凝土的塌落度、立方体抗压强度和劈裂抗拉强度试验,研究了BF、CF和矿渣三种因素对BF-CF/矿渣混凝土力学性能的影响。结果表明:BF-CF/矿渣混凝土立方体抗压强度和劈裂抗拉强度均高于C40基准混凝土,立方体抗压强度最大提高了21.0%,劈裂抗拉强度最大提高了35.3%。BF和CF的掺入均会减小混凝土的塌落度,BF对于塌落度的减小更加明显,BF对塌落度的最大降幅为67.1%;矿渣代砂率是影响BF-CF/矿渣混凝土立方体抗压强度的显著因素,随着矿渣代砂率的增大,立方体抗压强度先增大后减小,矿渣对立方体抗压强度的最大提高幅度为7.6%;BF是影响BF-CF/矿渣混凝土劈裂抗拉强度的显著因素,劈裂抗拉强度随BF体积率的增加而增大,BF对劈裂抗拉强度的最大增幅为12.0%,CF对劈裂抗拉强度的提升不明显。对正交试验的结果进行回归分析得出BF-CF/矿渣混凝土立方体抗压强度和劈裂抗拉强度预测模型,模型精度较高。

The slump,cube compressive strength and splitting tensile strength tests of 16 groups of basalt fiber-carbon fiber(BF-CF)/slag concrete and 1 group of C40 reference concrete were conducted by orthogonal experimental method.The effects of BF,CF and slag on the mechanical properties of BF-CF/slag concrete were investigated.The test results show that the cube compressive strength and splitting tensile strength of BF-CF/slag concrete are higher than the cube compressive strength and splitting tensile strength of C40 reference concrete,i.e.,the maximum increase of cube compressive strength is 21.0%,and the maximum increase of splitting tensile strength is 35.3%.The addition of BF and CF can reduce the slump of concrete,and BF can reduce the slump more significantly.The maximum drop of BF to the slump is 67.1%.The mass fraction of slag replacing for sand is a significant factor affecting the cube compressive strength of BF-CF/slag concrete.With the increase of mass fraction of slag replacing for sand,the cube compressive strength first increases and then decreases,and the maximum increase of slag to the cube compressive strength is 7.6%.BF is a significant factor affecting the tensile strength of BF-CF/slag concrete,and the tensile strength increases with the increase of the volume fraction of BF.The maximum increase of BF to the tensile strength is 12.0%,and the increase of CF to the tensile strength is not obvious.The results of the orthogonal experiment were regressed,and the prediction models of the cube compressive strength and splitting tensile strength of the BF-CF/slag concrete were obtained,and the accuracy of model is high.